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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Determination of 60° polarization nanodomains in a relaxor-based ferroelectric single crystal

    摘要： Here, we report a determination of monoclinic nanodomains in PMN-xPT with x ? 31%PT by using scanning convergent beam electron diffraction (SCBED). We show the presence of 60 6 a degree nanodomains with Cm-like symmetry as well as signi?cant variations (a) in local polarization directions across lengths of (cid:3)10 nm. The principle of our technique is general and can be applied for the determination of polarization domains in other ferroelectric materials of different symmetry. VC 2015 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4932955]

    关键词： ferroelectric materials,scanning convergent beam electron diffraction,monoclinic nanodomains,PMN-xPT,SCBED

    更新于2025-09-23 15:21:01

  • Effects of polymeric filler on polarization fatigue of 1-3 0.74Pb(Mg <sub/>1/3</sub> Nb <sub/>2/3</sub> )O <sub/>3</sub> -0.26PbTiO <sub/>3</sub> single crystal/polymer composites

    摘要： Polarization fatigue tests have been conducted on both bulk Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) single crystals and two 1-3 PMN-xPT/polymer composites with both “soft” and “hard” epoxy fillers, respectively. The variations of remnant polarization, coercive electric field, and micro-crack morphology under 10 Hz cyclic electric loading were studied. It was found that the magnitude of coercive field for both composites was higher compared to that of single crystals. However, as the number of cycles increases, the degradation ratio of remnant polarization and the increased portion of coercive field for both composites were lower than that of single crystals; the sequence is PMN-0.26PT bulk single crystal > 1-3 PMN-0.26PT/soft epoxy composites > 1-3 PMN-0.26PT/hard epoxy composites. In addition, the observed micro-crack propagation morphology shows that 1-3 PMN-0.26PT/hard epoxy composites can substantially improve fatigue-resistance owing to the lower stretching strain benefiting from the polymeric filler. Our results indicated that 1-3 PMN-0.26PT/polymer composites present much better electric polarization stability.

    关键词： epoxy fillers,PMN-xPT single crystals,polymer composites,micro-crack morphology,polarization fatigue

    更新于2025-09-09 09:28:46